New Triple Digital TO Analogue Converters From Solid State Supplies Provide High Speed Operation At Low Cost

Triple digital to analogue converters that are tailored to fit graphics and video applications where speed is critical are the first of a complete family of converters to be released by Solid State Supplies. The CDK3400/3401 devices have 8-bit resolution, are low-cost and their speeds are 100MSPS and 150MSPS respectively.

TTL-level inputs are converted to analog current outputs that can drive 25-37.5O loads corresponding to doubly-terminated 50-75O loads. A sync current following SYNC input timing is added to the IOG output. BLANK will override RGB inputs, setting IOG, IOB and IOR currents to zero when BLANK = L.

Although appropriate for many applications, the internal 1.235V reference voltage can be overridden by the VREF input. Double buffered for low distortion and having a ±0.2% linearity error , the CDK3400/3401 components are powered by a +5V supply and the only external components required are the current reference resistor, current output load resistors, and decoupling capacitors.

The CMOS package is a 48-lead TQFP and the operating temperatures is from 0 to 70°C. Applications include video signal conversion, multimedia systems, image processing, true-colour graphics systems, broadcast television equipment, High-Definition Television (HDTV) equipment and direct digital synthesis.

Other components in the family due to be released shortly include low cost triple D/A converters with 10-bit resolution and a version suited to PC graphics with 8-bit resolution and 180MSPS speeds.